Which Article of the NEC covers grounding? - ANSWER article 250
Which of the following is a 90 degree, explosion proof fitting? - ANSWER GUAL
What is a dropout plate? - ANSWER Metal plate with a curved surface for cable to
follow as it passes from the tray
All of the following are common service voltages in the United States EXCEPT: -
ANSWER 372/575 3-PHASE, 4-WIRE
What does a GFCI breaker do? - ANSWER Opens a circuit to prevent operation of
an electrical device
What will happen when one or more coils in a winding are grounded? - ANSWER
The motor will automatically blow fuses
Eight incandescent lighting fixtures are to be installed. Each fixture is 120- volts,
with a 200-watt lamp. What is the total connected load? - ANSWER 13.3 amps
The must be grounded in a bussed gutter if used as the main service equipment. -
ANSWER Neutral busbar
When wall mounting cable tray, ensure that - ANSWER The building structure is
strong enough to support the tray system
The purpose of sealing cable ends when reels of cable are in storage is -
ANSWER To keep moisture from creeping in
The outer covering on liguid-tight flexible metal conduit is used for - ANSWER A
moisture seal
A good electrical connection should - ANSWER Be mechanically and electrically
secure
The symbol normally used for duplex - ANSWER Circle with two parallel lines
drawb through it
Disconnecting means are covered in - ANSWER NEC Section 110-22
In relation to switches, the term throw refers to the - ANSWER Number of internal
operations that a switch can perform
,A 3-phase, 4-wire, 480v service requires ______ current transformer(s) - ANSWER
3
Services conductors and equipment are covered in - ANSWER NEC Article 230
The NEC required that all receptacles installed on 25 amp and 20 amp branch
circuits be ______ receptacles - ANSWER Grounding
A transformer with the primary of 400 turns and a secondary of 300 turns has a
_____ - ANSWER Step-down turns ratio of 4:3
The circular mil is based on the - ANSWER Cross-sectional area of the wire
Of the termination classes listed below, ____ is the only one that provides a seal
against external elements. - ANSWER Class 1
Unless otherwise noted. the calculations in AC circuits _____ values. - ANSWER
Rms
When the coil turns are increased the _____ - ANSWER Induced voltage is
increased
As the temperature surrounding a self-regulating heating cable rises, the ____ -
ANSWER Resistance of the polymeric core increases
The motor type that has the highest starting torque is the ____ motor. - ANSWER
Capacitor-start
For a given number of poles, the ____ determines the speed of an AC motor. -
ANSWER Frequency
Both induction and synchronous motors operate on the principle of a rotating
____ field - ANSWER Magnetic
A transformer has 200 turns in the primary, 150 turns in the secondary, and
120VAC applied to the primary. The voltage across the secondary is: - ANSWER
90Volts
The output capacity of a motor is rated in - ANSWER Horsepower
The synchronous speed at which a pole, 60 Hz induction motor operates is rpm. -
ANSWER 1,800
The sine of 0 degree is - ANSWER 0
, Meters used in AC circuits indicate the - ANSWER Effective
The component labeled 7 in figure 1 is a(n) - ANSWER End seal
In an AC circuit containing resistance only _____ will flow if the resistance is 10
ohms and the voltage is 120V. - ANSWER 12A
The _____ rotor types are generally rugged. - ANSWER Squirrel cage
Proofs tests are made at_ of the original factory voltage. - ANSWER 60%
Which type of heating cable cannot be cut and terminated in the field? - ANSWER
Mineral insulated
The secondary of a CT under load should not be opened because of_. - ANSWER
Induced high voltage
In a transformer ______ - ANSWER Electromagnetic Induction Ocurs
When a ground rod is installed, the top of the rod must be positioned ______
grade. - ANSWER Flush with or below
When making offset bends, the two kicks must be made perfectly parallel or the
resulting offset will have a _____ - ANSWER Crooked Bend
conduit that requires a 90 degree change in direction, except 42.All of the
following types of condulet may be used as a pulling point for _____ - ANSWER C
To be effective, a grounding system must limit the voltage on the electrical
system and protect it from all of the following, except _____ - ANSWER
Undervoltage conditions
What is the MOST common service used in a temporary power panel? - ANSWER
120/240 volt, 1-phase, 3-wire
What are the 2 MOST common types of overcurrent protective devices? -
ANSWER Circuit breakers and fuses
What instrument is used to perform an insulation-resistance test on a 480- volt
motor winding? - ANSWER Megohmmeter
Why is a seal installed in a run of conduit in a Class I location? - ANSWER
Prevent the passage of explosive gases in the conduit
Which of the following is the correct formula for OHM's law? - ANSWER I=E/R
Which of the following is a 90 degree, explosion proof fitting? - ANSWER GUAL
What is a dropout plate? - ANSWER Metal plate with a curved surface for cable to
follow as it passes from the tray
All of the following are common service voltages in the United States EXCEPT: -
ANSWER 372/575 3-PHASE, 4-WIRE
What does a GFCI breaker do? - ANSWER Opens a circuit to prevent operation of
an electrical device
What will happen when one or more coils in a winding are grounded? - ANSWER
The motor will automatically blow fuses
Eight incandescent lighting fixtures are to be installed. Each fixture is 120- volts,
with a 200-watt lamp. What is the total connected load? - ANSWER 13.3 amps
The must be grounded in a bussed gutter if used as the main service equipment. -
ANSWER Neutral busbar
When wall mounting cable tray, ensure that - ANSWER The building structure is
strong enough to support the tray system
The purpose of sealing cable ends when reels of cable are in storage is -
ANSWER To keep moisture from creeping in
The outer covering on liguid-tight flexible metal conduit is used for - ANSWER A
moisture seal
A good electrical connection should - ANSWER Be mechanically and electrically
secure
The symbol normally used for duplex - ANSWER Circle with two parallel lines
drawb through it
Disconnecting means are covered in - ANSWER NEC Section 110-22
In relation to switches, the term throw refers to the - ANSWER Number of internal
operations that a switch can perform
,A 3-phase, 4-wire, 480v service requires ______ current transformer(s) - ANSWER
3
Services conductors and equipment are covered in - ANSWER NEC Article 230
The NEC required that all receptacles installed on 25 amp and 20 amp branch
circuits be ______ receptacles - ANSWER Grounding
A transformer with the primary of 400 turns and a secondary of 300 turns has a
_____ - ANSWER Step-down turns ratio of 4:3
The circular mil is based on the - ANSWER Cross-sectional area of the wire
Of the termination classes listed below, ____ is the only one that provides a seal
against external elements. - ANSWER Class 1
Unless otherwise noted. the calculations in AC circuits _____ values. - ANSWER
Rms
When the coil turns are increased the _____ - ANSWER Induced voltage is
increased
As the temperature surrounding a self-regulating heating cable rises, the ____ -
ANSWER Resistance of the polymeric core increases
The motor type that has the highest starting torque is the ____ motor. - ANSWER
Capacitor-start
For a given number of poles, the ____ determines the speed of an AC motor. -
ANSWER Frequency
Both induction and synchronous motors operate on the principle of a rotating
____ field - ANSWER Magnetic
A transformer has 200 turns in the primary, 150 turns in the secondary, and
120VAC applied to the primary. The voltage across the secondary is: - ANSWER
90Volts
The output capacity of a motor is rated in - ANSWER Horsepower
The synchronous speed at which a pole, 60 Hz induction motor operates is rpm. -
ANSWER 1,800
The sine of 0 degree is - ANSWER 0
, Meters used in AC circuits indicate the - ANSWER Effective
The component labeled 7 in figure 1 is a(n) - ANSWER End seal
In an AC circuit containing resistance only _____ will flow if the resistance is 10
ohms and the voltage is 120V. - ANSWER 12A
The _____ rotor types are generally rugged. - ANSWER Squirrel cage
Proofs tests are made at_ of the original factory voltage. - ANSWER 60%
Which type of heating cable cannot be cut and terminated in the field? - ANSWER
Mineral insulated
The secondary of a CT under load should not be opened because of_. - ANSWER
Induced high voltage
In a transformer ______ - ANSWER Electromagnetic Induction Ocurs
When a ground rod is installed, the top of the rod must be positioned ______
grade. - ANSWER Flush with or below
When making offset bends, the two kicks must be made perfectly parallel or the
resulting offset will have a _____ - ANSWER Crooked Bend
conduit that requires a 90 degree change in direction, except 42.All of the
following types of condulet may be used as a pulling point for _____ - ANSWER C
To be effective, a grounding system must limit the voltage on the electrical
system and protect it from all of the following, except _____ - ANSWER
Undervoltage conditions
What is the MOST common service used in a temporary power panel? - ANSWER
120/240 volt, 1-phase, 3-wire
What are the 2 MOST common types of overcurrent protective devices? -
ANSWER Circuit breakers and fuses
What instrument is used to perform an insulation-resistance test on a 480- volt
motor winding? - ANSWER Megohmmeter
Why is a seal installed in a run of conduit in a Class I location? - ANSWER
Prevent the passage of explosive gases in the conduit
Which of the following is the correct formula for OHM's law? - ANSWER I=E/R
